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This summary is machine-generated.

The human penile urethra forms via a "Closing Zipper" mechanism. This study details urethra formation within the glans penis and prepuce development, revealing key cellular and molecular processes.

Keywords:
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Area of Science:

  • Developmental Biology
  • Human Embryology
  • Urology

Background:

  • Penile urethra development involves distinct "Opening Zipper" and "Closing Zipper" phases.
  • Understanding glanular urethra and prepuce formation requires further investigation.

Purpose of the Study:

  • To elucidate the morphogenesis of the human urethra within the glans penis.
  • To describe the developmental process of the human prepuce.
  • To identify key molecular markers involved in these developmental events.

Main Methods:

  • Examination of 48 human fetal penile specimens using scanning electron microscopy and optical projection tomography.
  • Histological analysis of serial sections.
  • Immunohistochemical localization of epithelial differentiation markers (Cytokeratins 6, 7, 10, FoxA1, uroplakin, androgen receptor).

Main Results:

  • Glanular urethra forms via direct canalization of the urethral plate, without an open groove, after penile shaft fusion.
  • Epithelial seam ventral to the glanular urethra is remodeled, establishing mesenchymal confluence.
  • Specific cytokeratins, FoxA1, and uroplakin are strategically expressed during glanular urethra formation, with androgen regulation suspected in ventral epithelial cell reabsorption.

Conclusions:

  • The human glanular urethra develops through a distinct process following penile shaft urethra formation.
  • Prepuce development involves dorsal formation followed by ventral midline fusion.
  • Androgens play a role in the remodeling and reabsorption of ventral urethral plate cells during penile development.